Meteorological Observations. xxxi 



Abstract of the Results of the Hourly Meteorological Observations 



taken at the Surveyor General's Office, Calcutta, in the 



month of April 1866. 



Monthly Results. 



Inches. 



Mean height of the Barometer for the month,... ... ... 29.779 



Max. height of the Barometer occurred at 9 a. m. on the 22nd, ... 30.074 



Min. height of the Barometer occurred at 5 p. m. on the 11th, ... 29.545 



Extreme range of the Barometer during the month, ... ... 0.529 



Mean of the daily Max. Pressures, ... ... ... ... 29.863 



Ditto ditto Min. ditto ... ... ... ... 29.700 



Mean daily range of the Barometer during the month, ... ... 0.163 



Mean Dry Bulb Thermometer for the month, ... ... ... 84.1 



Max. Temperature occurred at 4 p. m. on the 10th & 15th ... ... 102.6 



Min. Temperature occurred at 1 & 3 a. m. on the 22nd ... ... 68.4 



Extreme range of the Temperature during the month, ... ... 34.2 



Mean of the daily Max. Temperature .. . ... ... ... 94.0 



Ditto ditto Min. ditto, ... ... 76.7 



Mean daily range of the Temperature during the month,... ... 17.3 



Mean Wet Bulb Thermometer for the month, ... ... ... 76.9 



Mean Dry Bulb Thermometer above Mean "Wet Bulb Thermometer, 7.2 



Computed Mean Dew-point for the month, ... ... ... 71.9 



Mean Dry Bulb Thermometer above computed mean Dew-point. ... 12.2 



Inches. 

 Mean Elastic force of Vapour for the month, ... ... ... 0.773 



Troy grains. 



Mean Weight of Vapour for the month ... ... ... 8.28 



Additional Weight of Vapour required for complete saturation, ... 3.93 

 Mean degree of humidity for the month, complete saturation being unity 0.68 



Inches. 



Rained 9 days, — Max. fall of rain during 24 hours ... ... 1.16 



Total amount of rain during the month, ... ... ... 1.81 



Total amount of rain indicated by the Gauge attached to the anemo- 

 meter during the month. ... ... ... ... ... 1.37 



Prevailing direction of the Wind, ... S. & S. S. W. & W. S. W. 



